So, back to the original post: have you experienced phone calls not registering on the handset and going straight to voice mail? So far, that is the only negative I've experienced with the hardware or the service.

No missed calls so far.

It even rang through when I received a call while tethered and online.
(Which is working great while connected directly to Sprint's network.)
((I still need to try it when it's roaming))

I'm thrilled so far with the Sprint 8830's performance and lack of restrictions.